Figure 2
From: YVO4:Nd3+ nanophosphors as NIR-to-NIR thermal sensors in wide temperature range

(a) Normalized emission spectra of 4F3/2 − 4I11/2 transition obtained at different temperatures (123–873 K); (b) line position of 4F3/2 (R1) − 4I11/2 (Y1) transition as a function of temperature.